Telegraphic instrument.



UNITED STATES PATENT OFFICE.

HARRY T. JOHNSON, OF JERSEY CITY, NEW JERSEY.

TELEGRAPHIC INSTRUM ENT.

SPEGIFICATION forming part of Letters Patent No. 663,903, dated December1900 Application filed February 26, 1900. Serial No. 6,529. iNo model.)

To all whom it may concern:

Be it known that I, HARRY T. JoHNsoN, a citizen of the United States,and a resident of Jersey City, Hudson county, New Jersey,have madecertain new and useful Improvements in Telegraphic Instruments, of whichthe following is a full, clear, and exact description, reference beinghad to the accompanying drawings, forming part of this specification.

My invention relates to telegraphic instruments, such as sounder-s,which are provided with a vibrating armature and with electromagnets bywhich the armature is actuated; and the object. thereof is to provide asimple, positive, and efficient means for adjusting the position of thearmature so as to vary the distance between the same and the magnets.

In the drawings, Figure 1 is a side elevation, partly in section,of atelegraphic sounder embodying my invention. Fig. 2 is a plan viewthereof, showing also a section on the line 2 2, Fig. 1; and Fig. 3 isan end elevation showing a section on the line 3 3, Fig. 1.

Similar reference characters are employed to designate correspondingparts in all the Views.

The form of instrument which I have shown in the drawings is atelegraphic sounder of the usual type and comprises a base-board A, uponwhich the sounder is mounted. The electromagnets B, the anvil O, and thestandards or frame D, by which the armature-le ver E is supported, aresecured to the plate E, which is preferably of metal and is secured tothe base A. The armature-lever E, which carries the armature E, ispivotally mounted at e in the yoke G. The standards D are provided withoffsets or projections d, through which extend set-screws g, which formbearings upon which the yoke G is pivotally supported. A depending arm His secured to the yoke G, and the lower end of said arm is slotted toreceive the end of the adj usting-screw I, which works in thescrew-threaded standard 2', secured to the base. The inner end of theadjustingscrew is provided with a circumferential recess, and the slotin the arm H is reduced in size, so that the slot will lie in the recessformed in the inner end of the screw, sufficient play being allowed toperlation of said screw and the arm H. A compression-spring i, whichbears against the opposing faces of the standard 1 and arm H, serves tohold the arm H in positive engagement with the head or shoulder formedon the inner end of the screw I by the annular recess. The free end ofthe armature-lever E is normally held in contact with the contactscrewK, carried by the arm of the anvil, by a tension-spring L in the usualmanner, the spring L being connected with the end of the armature-leverand with the tension-shaft M, which is operated by the milled head m.

From the foregoing description it will be observed that when varyingcurrent conditions on the line render a variation in the operativedistance between the armature E and the poles of the electromagnetdesirable such variation may be quickly and accurately secured by simplyturning the adjustingscrew I. By turning the latter to the right the armII will be carried away from the standard 2' and the yoke G will beswung on its pivots to lift the ends of the yoke and the bearings of thearmature-lever E, thus increasing the distance between the armature andthe poles of the magnets. By turning the screw I to the left thisoperation will be reversed, the arms of the yoke and the bearings forthe armature-lever will be lowered, and the armature will be carriedcloser to the magnet-poles.

It is to be understood that I do not limit myself to the particular formor characterof mechanism which I have shown and described for adjustingthe position of the pivotal bearings of the armature-lever.

Having thus shown and described my invention, what I claim as new, anddesire to secure by Letters Patent, is

1. A. telegraphic instrument comprising a pivotally-supported frame,anarmature-lever pivoted in said frame eccentrically to the framesupportand means for adjusting the position of the frame to raise and lower thearmature-lever, substantially as shown and described.

A. telegraphic instrument of the character described comprising anarmature-lever, a swinging support therefor and an adj ustinit thenecessary variation in the angular re- 1 ing-screw for varying theposition of said supmature and magnet, substantially as shown ort toraise and lower the armature substanand described.

tiaily as shown and described.

nation with the magnet, armature and arma- 5 tnre-1ever, of a swingingsupport for the armature-lever and means for actuating said support tovary the distance between the ar- Wil n esses ARTHUR F. THOMPSON, WM. W.SI-LUV.

3. In a telegraphic instrument, the conlbi- HARRY T. JOHNSON.

